×

Switching an inverter with stored signal sequences

  • US 4,954,726 A
  • Filed: 12/22/1989
  • Issued: 09/04/1990
  • Est. Priority Date: 07/30/1986
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for controlling the conduction states of the output stage switches of an inverter connected to a power grid for controlling the real and reactive power components of the single frequency output of the inverter to the grid according to the respective magnitudes of real and reactive power command signals, comprising the steps of:

  • storing a plurality of groups of sequences of transition initiating signals for initiating transitions in the conduction states of the inverter output stage switches, each sequence for effecting a selected number of inverter output current reversals, each group of stored sequences having the same number of transition initiating signals within each of its sequences which is different than the number of transition initiation signals in the sequences of each other group;

    selecting in response to a reactive power command signal a stored sequence of transition initiating signals from one of said groups and providing a corresponding timed sequence of inverter output current reversals which in turn effects the commanded reactive power output component, said selected one of said groups being a group having a greater number of transition initiating signals in each of its sequences for a decreasingly leading and increasingly lagging reactive power command signal, said selected one of said groups being a group having a lesser number of transition signals in each of its sequences for an increasingly leading and decreasingly lagging reactive power command signal; and

    responding to leading and lagging real power command signals by respectively advancing and retarding the phase of the selected sequence to effect the commanded real power output component.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×